A brass component intended for use in contact with water, e.g. a component of a water piping system, must be made of a dezincification resistant alloy for retained strength. Dezincification causes embrittlement of the brass material, which in turn can give rise to cracks and eventually breakage of the component, sometimes resulting in extensive and expensive water damage. The use of dezincification resistant material reduces the risk of this type of failure.
Test of dezincification resistance for copper alloys with zinc (e.g. brass) according to ISO 6509-1 is performed on materials that will be exposed to fresh, saline waters or drinking water. The method is intended for copper alloys with a mass fraction of zinc that exceeds 15 %.
RISE is accredited by SWEDAC for determination of dezincification resistance according to ISO 6509-1.
Determination of dezincification resistance according to ISO 6509-1 is performed by preparing cross-sections of the component to be tested. The polished cross sections are exposed to a copper chloride solution at 75°C for 24 hours.
After exposure, new cross sections are prepared, perpendicular to the exposed cross sections, and the dezincification depth is evaluated and measured using an optical microscope.
For example, assessment can be made based on the approval criteria found in NKB (Nordic Committee for Building Regulations) Product rules. No approval criteria are specified in standard ISO 6509-1.
Results will be delivered as a report.
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Determination of dezincification resistance of copper alloys with zinc
Testing / Analysis / Evaluation
Corrosion, Material transition, Testing, Surface technology
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The test can usually be started within 2-3 weeks after receipt of order and test items (however depending on prevailing occupancy when ordering). The test then takes about 2 weeks to complete and report
The customer provides test items with correct designations/markings, and information about manufacturing method. The manufacturing method (i.e. if the samples are cast, forged, extruded, rolled, etc.) controls how samples for exposure are to be selected and also the required number of samples for exposure.